Problem 3.3: Determine the mass of a Sigma particle that decays into a pion and a neutron

Momentum of Σ+ particle in the x direction: px = MeV/c  (4000 MeV/c< px < 8000 MeV/c)

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A Σ+ (Sigma) particle decays into a neutron and π+ (pion). What is the mass of the Σ+?  For an initial momentum of 5000 MeV/c of the Σ+, what is the kinetic energy?   The rest mass of neutron is 940 MeV/c2 and the rest mass of a π+ is 140 MeV/c2(momentum is in units of MeV/c). Restart.

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